07.033GPPTerminal Adaptation Functions (TAF) for services using synchronous bearer capabilitiesTS
This annex describes the Layer 2 Relay (L2R) functionality required to support LAPB non‑transparently. The general aspects of L2Rs are described in specification GSM 07.01 . Figure 1 shows the three sub‑functions of the L2R.
Figure 1: Sub‑functions of the L2R
Section 2 describes the L2R Bit Oriented Protocol (L2RBOP) and section 3 describes the use of the L2RBOP to transport LAPB information fields.